Well, I was able to run 10 L2.nets on a 3.0 GHZ Intel computer with 512 ram... I just didn't bother using the map and it was using 30,000 k. Everything ingame was perfectly fine.
On my quad core computer (L2.NET takes advantage of multi-cores)... I was able to run 10 IG L2.NET's with clients without problems, and another 20 or so OOG l2.NET clients... 8 gigs ram and 1 gig vid card.
Quit being cheap and invest in a decent comp :P
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On a plus note, the autofighter is flawless next build, pickup bug is fixed, buffing is also flawless with reuse detections and such, and something brand new never seen in other bots is in the works. Your bot will soon be able to contour defined objects, you'll also be able to define... lets say 3 catacomb rooms and start botting, the bot will walk through the halls and continue on to the next rooms, clearing them out one by one, never getting stuck.
Im hoping to eventually get geodata in l2.net, never getting stuck on objects again.
But this could take a while, :)